Improvement in door-springs



DE wlTT C. KlNG.

vimpro-vement in Door-Springs.

lNo.128,891. 1 Patented my 9,1872.

N STATES DE WITT CLINTON KING, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN DOOR-SPRINGS.

Specification forming part of Letters Patent No. 128,891, dated July 9, 1872.

I, DE wm CLINTON x1NG,0f Besten, in

the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Door-Springs, of which the following is a specification:

N atme and Objects ofthe Irwention.

The nature of my invention relates to certain improvements in door-springs, consisting in the employment of a bored-out cylinder, containing a coiled spring pressing against a piston provided with a projecting sleeve. Through the said piston is screwed a rod that is attached, hinged, or otherwise to a suitable curved bracket, that is secured. to the door-frame; the said curved bracket projects with its lower part through a spherical boredout washer that embraces the base of the said bracket in a manner and for the purpose as will now be fully shown and described.

On the drawing, Figure 1 is a front elevation. Fig. 2 is a central longitudinal section over the line A B as taken on Fig. l. Fig. 3

-is a ground plan of the door, frame, and

spring, shown in a position as when the door is fully open.

Similar letters refer to similar parts whenever they occur on the different parts of the drawing.

a on the drawing is made to represent the door, gate, 85e., and b is the frame to the same. To the door c is attached a metallic cylinder, c, by means of screws going through ears d d. d d cast on the outside of the cylinder c, as shown. A coiled spring, e, is guided and made to operate in the cylinder c, as represented in Fig. 2. To the frame bis attached a curved bracket, f, vprovided in itsA lower end with a screw, g, whereby it may be firmly attached tothe frame b. The screw g projects through a washer, h, that is made with a concave seat on which the lower part of the bracket j' rests, as shown. The lower part of said bracket f is made convex, so as to iit the concavity in the washer h.

By this arrangement I am able to attach the bracket f in anydesired inclination to the frame b without interfering with any moldings,` thatvlnay exist ou the frame b.` The curved bracket f is forked in its upper end, and providedjwith` one or more holes,'f c', to which the connectingrod k ishinged in a manner as shown. The connecting -rod k projects through a tapering sleeve, l, provided with a head, m, in its rearV end, through which the rodV k is screwed, by which arrangement the sleeve l m may be screwed forward or back over the rod k for the purpose of increasing or decreasing the strength of the coiled spring e. The said spring e rests with one end against the bottom n of the cylinder c, and with its other end against the head m of the tapering sleeve l, as shown in Fig. 2. The sleeve lis provided with a polygonal projection, o, cast on it, by the arrangement of which the sleeve l may be turned by means of an ordinary wrench when needed.

The door or gate a is made to move on hinges p10 in the ordinary way.

By removing the pin q that connects the bracket f to the rod 7c, said rod 7c may be disconnected from the bracket f, and the rod k, sleeve l, and spring e can then easily be taken away, as may befdesirable on sundry doors during the summer season.

As will be seen from the above the only thing to be disturbed forthe purpose of dis connecting the spring is one small pin, q, without the need of removing the bracket j or the cylinder c that may remain on the door and frame till the spring may be wanted for use again. i

When the door is full open, as shown in Fig. 3, the action of the coiled spring will continue to keep the door open, as the bracket j is higher than the hinges p 1o, by the arrangement of which a pull back takes place on the door as soon as thepin q comes over the deadcenter of the hinges p p.

Having thus fully 'described the nature, construction, and operation of my invention, I wish to secure by LettersPatent and claim:

An improved door-spring, consisting of the hollow cylinder c containing the spring e, and having a sleeve, l, through which works the connecting-rod k, which rod is hinged to a curved bracket, f, convex at its lower part, and fitting into a concave seat in the washer h interposed between it and the door-frame, all constructed, arranged, and operating as described and shown, for the purpose set forth.

DE WITT CLINTON KING.

Witnesses z ALBAN ADRN, WM. H. HU'reHINsoN. 

